Electron-discharge device



Dec. 15, 1925' 1.565.562

'r. R. GRIFFITH ELECTRON D1 5 CHARGE DEVI CE Fil ed Feb. 21, 1925 Patented D... 15, 1925.

umrao stares PATENT orrice. I

THOMAS 3. GRIFFITH, 01F DOVER, NEW JERSEY, ASSIGNOB, BY MESNE ASSIGNMENTS,

'ro wnsrnnn' ELECTRIC COMPANY, INCORPORATED, A conronar'ron or New YORK.

Emerson-Discusses :onvrcn.

Application sled February 21, 1925. Serial No. 10,761.

To all whom it may concern: 1

Be it known that I, THOMAS E. GRIFFITH, a citizen of the United States, residing ,at Dover, in the county of Morris, State of New J ersey,l1ave invented new and useful Improvements in Electron-Discharge Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to electron discharge devices and has for an object an improved supporting structure for the cathode thereof. I v

This object is attained by providing a highly refractory sheet metal nest having a flattened cylindrical portion anda boxlike portion, centrally positioned around the cylindrical portion. A pair of insulators carrying filament hooks are positioned within the cylindrical portion and are held therein-by the box-like portion. This arrangement provides a sim 1e and eflicient structure for the support of the filament in an electron discharge device.

Referrin to the drawings:

Fig. 1 illustrates an electron discharge device of the exterior anode type embodying this invention.

Fig. 2 is an enlarged perspective view of the assembled structure; and

Figs. 3 and 4 illustrate different steps in the assembly of the device.

The electron, discharge device comprises an enclosing vessel having a glass portion 10 and a cup-shaped metal portion 11, the metal portion actin as the anode of the device. A helical wire grid 12 is supported within the enclosing vessel and is coaxial with the anode 11. A. cathode or filament 13 is sup orted within the grid 12 by means of a higlily insulated sup orting structure made in accordance with this invention. A cylindrical base 14 is attached to the glass portion 10 and carries the various leading-in wires for the electrodes within the vessel.

The filament support made in accordance lar to the band 15 is formed into a box-like sleeve 19 and is'provided with apertures 20 inv the upper and lower surface. The inside dimensions of the sleeve 19 are determined by the width and height of the cylindrical band 15, so that the sleeve will fit snugly over the flattened cylinder 15. One edge of the sleeve 19-is rovided with diagonal cuts to provide a ap 21.

Thejnethod of assembling this'supporting structure is shown in Figs. 3 and 4 and consists in placing one of the insulating inserts 16 in one end of the flattened cylinder 15. The flat portions of insert 16 are positioned toward the center'of the cylinder and the rest of the surface of the insert follows the contour of the cylinder 15. The sleeve 19 is then inserted overthe band 15 and completely encloses the cylindrical portion of the insert, while the upper and lower edges of the sleeve are in contact with the flattened portions 17 and 18 of the insert 16. A similar insulating insert is lowered into the space between the sleeve 19 and the c lindrical band 15 and in opposing relation with respect to the first mentioned in- 1 sert. The flap 21 on the sleeve 19 allows the free passage of the cylindrical portion of the insert intermediate the flattened portions. However, the lower edge of the sleeve prevents the insert dropping through and when the cylindrical portio'n22 is completely within the band 15, the flap 21 is pressed down in contact with, the flattened portion 17 of the insert. The assembled nest is then adjusted to clamp together the cylindrical band 15 and the box like sleeve 19-. A supporting rod 23 is passed through the a ertures 20 in the sleeve 19, and a shoul er 24. on the rod forms a support for the nest. The end of the rod projecting from the sleeve 19 may be fused to form a bead or button 24 to rigidly connect the sheet metal nest to' the rod. A molybdenum suspension hook 25 is held in each insulating insert. This construction provides a highly insulated device for the su port of the filament 13. Furthermore, ,t 1s invention affords aneasily constructed nest in which the fusing operations are reduced to a minimum.

Although the invention has been disclosed with respect to the particular arrangement, it is of course understood that various modi-. fications may be made in the detailed con- ,said cylinder and retaining said member therein, and a filament carriedby said mem-' ber.

2. A filament support comprising a fiattened metal-cylinder, an insulating member within said cylinder, apertured means surrounding said cylinder and retaining said member therein, a rod passing through said apertured means and fastened thereto, and a filament carried by said member.

3. A filament support comprising a flattened metal cylinder, cylindrical insulating members having undcr-cut portions, said members being arranged in parallel within said cylinder, a metallic retaining member surrounding said cylinder between said insulating member and engaging said undercut portions, a supporting rod passing through said retaining inember and a filament suspended from said insulating members.

i. .A filament support comprising acylindrical metal portion, insulating members having under-cut ends in said portion, a metallic retaining member surrounding saidportion between said insulating members, the horizontal edges of said: retaining member abutting said under-cut ends, a supportingrod extendingthrough said retaining memher, and a filament supported from said in=-- sulating members.

5. A filament su port comprising a flattened metal cylin'er, insulating members Within said cylinder, means for retaining said members Within said cylinder, said. means also spacing said members from each other, and a filament suspended from said members.

6. A filament support com irisi a metallic nest having" a iiatteneci. o ndrical portion and a box-litre portion positioned around said-cylindrical portion, insulating member held within. said T "t and a filament suspended from said z'ueinber.

7. A filament sup ort comprisi a metallic nest having a atte'ned cyli ical portion, a pairof cylindrical insun mem-' bers having reduced ends projecting from said cylindrical portion, a box-like portion surrounding said cylindrical portion and.

clamping said'memb'ers within said cylindrical portion, a supporting rod passing through said box-like portion, and a. filament carried by said members;

' 8. A filament support comprising ametal cubical member, a metal member passing through said cubical member and havin closed portions projecting from either an thereof, an insulating member-in each ofsaid closed-portion, said cubical member preventing the movement of said insulating members, and supporting means passing through said cubical member.

9. A filament support comprising a metal cubical member, a closed metal band passing "through said cubical member, an insulator on either side of said member, said insulator having a surface to fit the contour of said band, and means on said insulator to pre vent movement from said band.

10. A filament support comprising a flattened cylindrical metal band, an insulating insert in each arc of said band, metallic means surrounding said band and enclosing the portion of each insert, and supporting means passing through said metallic means for clamping said inserts within said band.

11. A filament support comprising metallic closed band, an insulating insert 111 each are of said band, sa1d insert having a flat portion pro ecting from either of said band, a metal sleeve surrounding said band at right angles to its axis, the edges of said sleeve abutting said flattened portions, and means for clamping said inserts within said hand, said means comprisin a metallic rod fused to one surface thereo 12. A filament support comprising a flattened cylindrical band, an insulating insert in each arc of said band, an apertured sleeve surrounding said band and enclosing a portion of each insert, resilient means on said sleeve-preventing movement of said insert, a supporting rod rigidly held in said sleeve, and a filament supported from said inserts.

lin witness whereof, i hereunto subscribe my name this 18th day of liebruary A. 1)., i925. 

